Underground Steel Gas Pipe

Standard:API, ASTM
Standard2:API 5CT, API 5DP, ASTM A106-2006,
ASTM A53-2007, ASTM A210-1996
Grade Group:Q195-Q345, 10#-45#, API J55-API P110
Grade:Q235, Q345, Q195, Q215, 10#, 20#, 45#,
API J55, API K55, API N80, API L80, API P110
Thickness:6.35 - 16.13 mm
Section Shape:Round
Outer Diameter(Round):4.5 - 20 inch
Place of Origin:Hebei, China
Application:Oil Pipe, Gas Pipe
Technique:Hot Rolled
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Product Details

Product Details

In the old days, sometimes after a long time. This was generally due to the poor quality of galvanizing. Today using galvanized pipe generally presents no threat. Plumbers tend to use black pipe with gas for two main reasons.

Brief Introduction

Underground steel gas pipe

Underground gas pipe seamless steel pipe

Products name:

Underground gas pipe seamless steel pipe





Wall Thickness



GB/T13793-1992,GB/T14291-2006, GB/T3091-1993,GB/T3092-1993,GB3640-88
BS1387/1985,ASTM A53/A36,EN39/EN10219,API 5L,GB/T9711.1-99 etc


T/T : 30% T/T advance, 70% balance copy of B/L ;L/C : at sight ;T/T and  L/C:40% T/T  advance,    60% L/C at sigh ;  Western Union

Delivery time

15-30 days after we confirm your order


(1)25 tons/container for pipe with usual outer diameter.  (2)For 20GP container the max length is 5.8m; 
(3)For 40GP container the max length is 12m. 
(4)bulk shipping
(5)as per customer's option


+/- 5%


we accept your sample requirement


Small order is acceptable(1 ton)


welcome to our factory at anytime


ISO 9001-2008  BV TUV


we accept  third party testing

Underground pipes Underground Steel Gas Pipe

An underground pipe is a pipe laid underground to carry liquid, gas or loose solids.Clay fired underground drainage pipes have long been used in ancient China.Beijing, the capital of the Ming dynasty, largely used brick and stone masonry underground drainage pipes.It is about 1 meter wide and 2 meters high.There are many different kinds of modern underground pipes, round, oval, more than half the oval, round, heart-shaped, oval, rectangular (single and double hole and porous), horseshoe cross section form, using steel, cast iron, concrete, reinforced concrete, prestressed concrete, brick, stone, asbestos cement, clay, plastics, glass fiber reinforced plastic (reinforced plastics), and other materials.


Precast concrete circular pipe and precast reinforced concrete circular pipeThey are all mill made mechanism tubes, manufactured by centrifugal method, roll suspension method and vertical extrusion method.Concrete pipe shall be used when the inner diameter of the pipe is less than 400mm;Use reinforced concrete tubes for greater than 500 mm.In the 1970s, China had produced and laid large-diameter pipelines with a diameter of about 2000 mm.The wall thickness of the round pipe is 1/12~1/10 of the inner diameter, the concrete mark is no less than 300, and most of the steel bars are made of cold-drawn mild steel wire.Cement mortar or steel wire mesh can be used for plain pipe interface.Tongue-and-groove pipe joints are filled with expanded cement or asbestos cement;When the impermeability requirement is higher, precast or field poured concrete jacket-ring joints should be used, and cement mortar, expanded cement or asbestos cement and other materials should be used to fill in the pipe joint.

Prestressed concrete pipePipes with inner diameter of 400~1400 mm can be used in pipes with working pressure of 0.4~1.2 mpa.When working pressure is less than 0.4 mpa, the maximum pipe diameter can reach 4000 mm.Adopt socket joint and circular rubber seal seal.There are two kinds of tube-making technology, one is core-wound wire and the other is vertical vibrating extrusion.Concrete mark no less than 400, prestressed steel wire with high strength cold drawing.

Self-stressing concrete pipeUsed for water pipeline with working pressure of 0.4~1 mpa.Inner diameter 100~600 mm.Adopt socket joint and circular rubber seal seal.The utility model relates to a reinforced concrete pipe which is prestressed by tensile steel bar made of expanded cement.

Cast iron pipeFor use in water pipelines with working pressure not exceeding 1 mpa.Divided into three types: low pressure pipe (less than 0.45 mpa), common pressure pipe (0.45~0.75 mpa) and high pressure pipe (0.75~1 mpa), the pipe diameter can reach 1200 mm.There are continuous casting and sand casting (vertical and centrifugal) two kinds of pipe process.

Steel pipeUsed for water, oil and gas pipelines with working pressure less than 1 mpa, with inner diameter of more than 3000 mm.When the inner diameter is greater than 1600 mm, the rigid ring can be welded on the pipe wall to reduce the thickness of the pipe wall.Adopt welding interface.

Masonry pipelineFor water and drainage pipes without internal pressure, the cross section is usually rectangular or arched.Brick and stone pipelines are widely used in China due to their cheap local materials, convenient construction, and the size of pipelines can be arbitrarily adjusted according to the terrain and flow.The net width of the rectangular section can reach about 4 meters, up to 3 meters.Arched section has the upper part to be semicircle commonly, the lower part is the horseshoe shape of straight wall and much circle heart two kinds of forms, net width can amount to 4 meters or so.

Most masonry pipelines use concrete or reinforced concrete floor, and the roof of rectangular section pipeline also USES reinforced concrete precast board.Because the masonry anti-seepage ability is poor, generally USES the cement mortar surface anti-seepage, therefore, is not suitable for the anti-seepage request high pipeline.Brick and stone rectangular pipes can also be used for underground passage and semi-passage of heating and cable trench.

Reinforced concrete pipelineUsed for large and medium-sized water conveyance and drainage pipeline with high requirement of anti-seepage.The inner diameter of the large size pipe poured on site is larger when the working internal pressure reaches 0.2 mpa.The large single-hole rectangular section built in China has a net width of 8.5 meters and a net height of 4.2 meters.In the double-hole section, the net width and net height of each hole are up to 7 meters and 3.5 meters respectively.Rectangular and arched sections of medium size can also be prefabricated.

Product manufacturing process

Product size

Cangzhou Steel Pipe Group (CSPG)Co.,Ltd.

No.92 JieFang East Road ,Cangzhou City, Hebei,P.R.China.

 has more than eighteen years history company which located in Lecong Iron and Steel World, a well-known steel distribution center in China, with superior geographical position and convenient water and land transportation. 


We are a direct-selling manufacturer specializing in the research and development of oil casing  steel pipes, steel spiral pipes, anti-corrosion steel pipes inside and outside. Since its inception, the company has been guided by a brand-new thinking of steel pipe product market based on the business philosophy of honesty, pragmatism and knowledge-seeking.


Why to choose us?

1.We provide products to our customers individual specifications and special needs with competitive price and best service.

2. Immediate respond

We will be 24/7 on line at your services. Provide one-to-one service with our sincerity.

3. Professional suggestions

We could provide you the professional suggestion with our expertise acumen.

4. Short delivery period

We are based on a long-term cooperation with several major domestic steel company with an outstanding advantage is sufficient supply. Shorter the supplying period.







Edit by Ms. Vicky of  CSPG

Contact us directly by:

Email: ella@cnspipe.com  ,vicky@cnspipe.net

Tel / Whatsapp: +86-180327140146

Skype: cnspipe002

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